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Walmart has 50′ extension cords 16/3 SJTW for just under $ 10:

https://www.walmart.com/ip/WorkChoice-50-SJTW-16-3-Green-Outdoor-Extension-Cord/44739952

https://www.walmart.com/ip/Hyper-Tough-50ft-16x3c-Orange-Extension-Cord/484726741 [walmart.com]

Also a 25′ one for $ 5.47:
https://www.walmart.com/ip/Hyper-…/735522295